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diff --git a/js/src/tests/test262/intl402/Locale/prototype/minimize/removing-likely-subtags-first-adds-likely-subtags.js b/js/src/tests/test262/intl402/Locale/prototype/minimize/removing-likely-subtags-first-adds-likely-subtags.js
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+++ b/js/src/tests/test262/intl402/Locale/prototype/minimize/removing-likely-subtags-first-adds-likely-subtags.js
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+// Copyright 2020 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-Intl.Locale.prototype.minimize
+description: >
+    The "Remove Likely Subtags" algorithm adds likely subtags before processing the locale.
+info: |
+    Intl.Locale.prototype.minimize ()
+    3. Let minimal be the result of the Remove Likely Subtags algorithm applied to loc.[[Locale]].
+       If an error is signaled, set minimal to loc.[[Locale]].
+
+    UTS 35, §4.3 Likely Subtags
+    Remove Likely Subtags
+
+    1. First get max = AddLikelySubtags(inputLocale). If an error is signaled, return it.
+    2. ...
+features: [Intl.Locale]
+---*/
+
+var testDataMinimal = {
+    // Undefined primary language.
+    "und": "en",
+    "und-Thai": "th",
+    "und-419": "es-419",
+    "und-150": "en-150",
+    "und-AT": "de-AT",
+
+    // https://unicode-org.atlassian.net/browse/ICU-13786
+    "aae-Latn-IT": "aae",
+    "aae-Thai-CO": "aae-Thai-CO",
+
+    // https://unicode-org.atlassian.net/browse/ICU-10220
+    // https://unicode-org.atlassian.net/browse/ICU-12345
+    "und-CW": "pap",
+    "und-US": "en",
+    "zh-Hant": "zh-TW",
+    "zh-Hani": "zh-Hani",
+};
+
+for (const [tag, minimal] of Object.entries(testDataMinimal)) {
+    // Assert the |minimal| tag is indeed minimal.
+    assert.sameValue(new Intl.Locale(minimal).minimize().toString(), minimal,
+                     `"${minimal}" should be minimal`);
+
+    // Assert RemoveLikelySubtags(tag) returns |minimal|.
+    assert.sameValue(new Intl.Locale(tag).minimize().toString(), minimal,
+                     `"${tag}".minimize() should be "${minimal}"`);
+}
+
+reportCompare(0, 0);